强制报告事件发生后，所在地的空中交通管制单位应当在事发后24小时内填写《空管不安全事件报告表》，并报所在地区管理局。
参考答案：对
_______,I lost heart in English learning,but my teacher often said to me,"Keep on working hard; you'll
succeed________."[ ]
A. At a time; in time
B. At a time; on time
C. At one time; in time
D. At one time; on time
材料库内物品码垛要整齐，物资须距电线、灯泡50厘米以上，灯泡不得超过（）瓦。易燃易爆物品库，应安装防爆灯，严禁库内乱拉照明线。
A、100
B、50
C、60
